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    <!-- 
        1.打印九九乘法表
        2.打印1-100之间的质数

     -->
     <script>
         for(i=1;i<=9;i++){
             for(j=1;j<=i;j++){
                 document.write("<span>"+j+"*"+i+"="+i*j+"</span>");
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        //  打印2到100所有的数‘
       
        for(i=2;i<=100;i++){
            var flag=true;
            for(j=2;j<i;j++){
                if(i%j==0){
                    flag=false;
                }
            }
            if(flag){
                console.log(i);
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